linux-kernel - Re: [RFC PATCH 07/16] debugfs: Add signed versions of debugfs_create

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Date:   Fri, 18 Mar 2022 14:21:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        sudeep.holla@....com, james.quinlan@...adcom.com,
        Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
        vincent.guittot@...aro.org, souvik.chakravarty@....com,
        peter.hilber@...nsynergy.com,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC PATCH 07/16] debugfs: Add signed versions of
 debugfs_create_u32/64 helpers

On Sun, Feb 27, 2022 at 08:55:59PM +0000, Cristian Marussi wrote:
> Add a few helpers to deal with signed values integers; built on existing
> debugfs internal helpers as the existing unsigned functions already do.
> 
> Make the simple_attr_write() internal helper detect the sign of the
> requested set operation from the related format string: this is needed
> to be able to properly parse negatively signed input strings.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---
> Note that in the rest of the series I do NOT need the s64 WRITE/SET
> operations, that required the more invasive simple_attr_write() change,
> but it seemed odd to implement a get only debug_create_s32/64 API.

Let's wait to add them when we have a need for them with a in-kernel
user.  Otherwise I'll just end up removing them eventually when I sweep
for "is this used" cleanups.

thanks,

greg k-h